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{ <br /> Chevron <br /> F. Chevron U.S.A. Inc. <br /> 2410 Camino Ramon, San Ramon, California • Phone (415) 842-9500 <br /> Mail Address:P.O.Box 5004,San Ramon,CA 94583-0804. <br /> December 4, 1990 <br /> Marketing Operations Y <br /> D. Moller <br /> Manager,Operations <br /> S. L. Patterson <br /> Area Manager,Operations <br /> C. G.Trimbach <br /> Manager,Engineering <br /> g . <br /> Ny�Ro FC , <br /> Ii Mr. Gerald FacinoA� <br /> ._ <br /> The Earth Technology Corporation ���j/�T.Q� <br /> 100 W. Broadway, Suite 5000 SFRyeti <br /> , `=Long Beach, CA '90802 `= - -- _ _ ,_, __ _ _1/z <br /> Re: Field Test of BAT System at j <br /> Chevron SS #9-4275 <br /> 2905 W. Benjamin Holt Drive <br /> Stockton, California <br /> Dear Mr. Facino: <br /> As we have discussed in recent phone conversations, Chevron is interested in performing a field test J <br /> of the BAT system at the above referenced site. Tis objective of this field test s t o <br /> determine the effectiveness of the BAT system as a means of investigating and monitoring subsurface <br /> groundwater contamination at service station sites. The results of this field test will be considered <br /> by Chevron in evaluating the practical use of the BAT.system. The results of this field test will also <br /> be made known to environmental regulatory agencies in an effort to secure their familiarity with and <br /> confidence in the data provided by the BAT system. <br /> I have enclosed three reports which supply information regarding the site chosen for the field test. <br /> The reports are listed below. Let me know if more information is needed. <br /> "Monitoring Well Installation", Western Geologic .Resources, April 13, 1989 <br /> "Workplan for Additional Monitoring Well Installations", Groundwater Technology, <br /> June 1990 <br /> "Quarterly Groundwater Monitoring Report"; Alton Geoscience;September 21, 1990 d # <br /> In order for Chevron to obtain the required permits from San Joaquin County for installation of the <br /> BAT system, Earth Technology must submitan addendumto the enclosed workplan which was <br /> prepared by Chevron's consultant, Groundwater Technology, Incorporated (GTI). The addendum <br /> should be sent to Chevron, and Chevron will forward a,copy to the appropriate regulatory agencies. <br /> GTI will apply for the permits once the addendum has been submitted. <br /> Chevron requests that the field test be composed,of two phases performed concurrently. The <br /> workplan addendum should describe worksteps involved in both phases. Phase 1 will serve to ( I <br /> compare the results obtained from the BAT system with results obtained from standard groundwater <br /> monitoring wells. Phase 2 will: entail the use of the.'BAT system to determine the extent, of <br /> contaminant plumer migration. 1 <br /> w <br /> . _ I <br />